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A61InspectionofbearingCleaningofbearingWheninspectingabearingafterremoval,theappear-anceofthebearingshouldberecordedfirst.Then,aftertheresidualamountoflubricantischeckedandasampleoflubricantiscollected,thebearingshouldbecleaned.Forcleaning,lightoilorkeroseneiscommonlyused.Cleaningisdividedintoroughcleaningandfinalcleaning,andwiregauzeissetasaraisedbottominacontainertopreventthebearingfromtouchingthebot-tomofthecontainer.Lubricatinggreaseandadheringsubstancessuchasforeignparticlesareremovedwithabrush,etc.,usingoilforroughcleaning.Careshouldbetakenduringthisprocess,becauseifthebearingisturnedwithforeignparticlesattached,theracewaysurfacesmaybescratched.Finalcleaningiscarriedoutbyturningthebearingincleaningoil.Itisdesirablethatthecleaningoiliskeptcleanbyfiltering.Immediatelyaftercleaning,thebearingmustbeprotectedagainstcorrosion.InspectionandevaluationofbearingThejudgementastowhethertheremovedbearingisreusabledependsontheinspectionaftercleaning.Conditionsoftheracewaysurfaces,rollingelementsandfittingsurfaces,wearconditionofthecage,increaseofbearingclearance,dimensions,rotationalaccuracy,etc.shouldbecheckedfordamageandabnormalities.Theevaluationisperformedbasedontheexperiencetakingintoconsiderationthedegreeofdamage,machineperformance,importanceofthemachine,operatingconditions,perioduntilthenextinspection,andothersuchfactors.MaintenanceandinspectionMaintenanceandinspectionMaintenanceandinspectionarecarriedouttomain-taingoodperformanceofbearingsinstalledinthemachine.Maintenanceisperformedbycheckingthemachineoperatingconditions,checkingandreplenishingorreplacingthelubricant,checkingthebearingandrelatedpartsbyperiodicdisassemblyandothersuchprocedures.Itemsforinspectionofarunningbearinginamachineincludethebearingtemperature,noise,vibrationandconditionoflubricant.Whenanyabnormalityisfoundduringoperation,thecauseshouldbeinvestigatedandmeasurestakenbyreferringtothesectiononrunningtestonpageA59.Whenremovingabearing,refertothesectionondis-mountingonpageA59.Damage,causesandcorrectiveactionRollingbearingscangenerallybeusedfullyuptotheirrollingfatiguelifeiftheyareproperlyselected,mount-ed,operatedandmaintained.However,theymayactuallybedamagedearlierthantheirexpectedlife-timescreatingproblemsoraccidents.Commoncausesofdamageincludeimpropermountingorhan-dling,insufficientlubricationandpenetrationofforeignparticles.Itmaybedifficulttodeterminetheexactcauseofaproblembycheckingonlythedamagedbearing.Theconditionsofthemachinebeforeandaftertheoccur-renceofthedamage,thelocationandtheoperatingandambientconditionsofthebearing,thestructurearoundthebearing,etc.shouldalsobeexamined.Itthenbecomespossibletoassessthecauseofthedamagebylinkingtheconditionsofthedamagedbearingtotheprobablecausesarisingfromthemachineoperation,andtopreventtherecurrenceofsimilarproblems.Commontypesofdamage,causesandcorrectiveactionarelistedinTable41.
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